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  1. #1

    Question Subwoofer: Facing Down or Up?

    Hello, all:

    Has anyone had experience with both up and down facing subwoofer installation in an extended cab truck? Or just one of those positions?

    I have to decide if I will mount one or two sub woofers facing up or down. I have a current sealed box facing forward. Sounds great. 8 inch sub. But I want a larger unit, so it has to go up or down. The interior is all out of the rig, so now is the time to design something for a larger sub woofer or two.

    Any personal experience on these options as far as sound, vibration, etc. would be appreciated.


    1994 Chevy K2500 Silverado, 454 (modified), original owner.
    And other vehicles and toys.

    "...If you can meet with triumph and disaster
    And treat those two imposters just the same;'ll be a Man, my son!" Rudyard Kipling

  2. #2

    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Piermont,NY, back in Northern NJ now, But may be in IL soon....


    Faceing down you might have a deeper sound almost like a Bandpass. So your 8 could sound like a 10. It's a smaller space for the air to move and fill up..
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  3. #3
    Jr. Mechanic
    Join Date
    May 2011
    Bridgeville, PA (Pittsburgh)


    The closer a wall, floor, seat, etc. are to the face of the subwoofer, the louder it will be. This is due to the fact that the sound waves bounce off of the wall, or whatever it may be, and go throughout the cab in more than one direction. Right now I have a 12" Kicker L7 facing up in my crew cab, and unfortunately I was unaware of this fact before I had the custom box made. I had the sub previously in an S-10 extended cab facing towards the front right behind the drivers seat. From what I recall, the S-10 was nearly twice as loud as it is now. Now mind you the cab was smaller, but the sub would pound right behind my seat compared to my sub now which just goes towards open space.

    Hope this helps!
    2010 Red Silverado Crew Cab Z71 LT
    Blacked Out
    15% Tint all around
    22" KMC Slide Series Black Chrome Rims
    305/45/22R Nitto Dune Grappler Tires
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    4 Kicker RS Componet Speakers
    Kicker 12" L7 subwoofer w/ Kicker ZX1500.1 Amplifier

  4. #4


    Definitely down.

  5. #5

    mfleetwood's Avatar
    Join Date
    Jul 2010
    Denver, CO
    Blog Entries


    x3 on facing down.

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
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  6. #6
    Master Mechanic zigger215's Avatar
    Join Date
    Sep 2011
    Fairbanks, Alaska


    In the 99-2007 trucks, up firing boxes will allow you to fit bigger subs (deeper), down firing has always seemed to sound better to me.

  7. #7


    down fire for sure!
    2000 Chevrolet Silverado

    4.3L V6, 4L60E, 2WD, Single Cab
    Airaid CAI
    Poweraid TB Spacer
    Flowmaster 10-series exhaust (dumped)
    Edge CS insight monitor
    4.10 gears
    Limited-slip differential
    LS-1 Dual Electric fans
    Corvette tranny servo swap

    Head Unit: Alpine
    Speakers: Alpine SPR-60C 6.5" component set, 4X6 Infinity Kappas
    Subs: 2-12" Kicker CVT's
    Amps: Alpine-M1000 (subs), Alpine MRX-F65 (Speakers)

    305/70R16 NITTO Terra Grapplers
    16" PROCOMP 7089's
    2" leveling kit
    3" Fabtech Spindle Lift Kit
    Front/Rear-Bilstein 5100 shocks

    35W HID Low Beams
    RECON LED smoked roof cab lights
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    Powerstop-red powdercoated brake calipers
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  8. #8


    I've had both up and down in my 2004 extended cab. I prefer the down firing much more than the up firing. The only rattle problems I've had with the down fire is the spare tire tools. Rearranged them a bit and that problem went away. If you want to go bigger, a 12" downfire is about all you'll fit. 10" is a nicer fit but my 12" still hides itself under the seat nicely.

    2010 OEM 20" Wheels
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    Completely debadged and demolded
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    Tailgate light bar
    Flowmaster Delta 50 w/ double tip exits
    Blue footwell lighting
    12" Pioneer Sub (custom downfire box) 850W amp
    Full LED interior

  9. #9


    Since you have to have a lip on the side where the woofer is mounted to allow for cone excursion, when pointing it down are you leaving one or two sides with no lip to allow air to move?

  10. #10


    Quote Originally Posted by The Heater View Post
    Since you have to have a lip on the side where the woofer is mounted to allow for cone excursion, when pointing it down are you leaving one or two sides with no lip to allow air to move?
    When I built my box I left both sides open. It's pushed up against the back cab so it may as well just have only one side open.

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